Purging users makes Twitter’s advertising business more healthy

The company has been showing as much during the last year, as the social network shifts from a growth-at-any-cost mode to one of actually making money. Its monthly active user base remains stuck in the low 300 million range. And that actually took a hit in the third quarter, falling by nine million users as the company continued its effort to clean out questionable accounts. Twitter said it expects to see another decline in the fourth quarter in the mid-single-digit-millions...